\begin{table}

\caption{Registration and Voting by Treatment Arm and Prior Registration}
\centering
\begin{tabular}[t]{lccc}
\toprule
  & Baseline Registration & (Re)Registration & Turnout\\
\midrule
(Intercept) & \num{0.018}* & \num{0.017}* & \num{0.003}*\\
 & (\num{0.002}) & (\num{0.002}) & (\num{0.001})\\
Information-Only Mail (T1) & \num{0.003} & \num{0.003} & \num{0.002}\\
 & (\num{0.003}) & (\num{0.003}) & \vphantom{1} (\num{0.001})\\
Research-Informed Mail (T2) & \num{0.007}* & \num{0.007}* & \num{0.004}*\\
 & (\num{0.003}) & (\num{0.003}) & (\num{0.001})\\
Already Registered & \num{0.977}* & \num{0.023}* & \num{0.159}*\\
 & (\num{0.002}) & (\num{0.004}) & (\num{0.007})\\
Information-Only x Already Registered & \num{-0.006} & \num{0.003} & \num{0.003}\\
 & (\num{0.004}) & (\num{0.006}) & (\num{0.010})\\
Research-Informed x Already Registered & \num{-0.006} & \num{0.006} & \num{0.006}\\
 & (\num{0.003}) & (\num{0.006}) & (\num{0.010})\\
\midrule
Num.Obs. & \num{23768} & \num{23768} & \num{23768}\\
\bottomrule
\multicolumn{4}{l}{\rule{0pt}{1em}* p $<$ 0.05}\\
\end{tabular}
\end{table}
